Emergency personnel remove evidence near a covered body after a World War One armament exploded in Ypres, Belgium on Wednesday, March 19, 2014. According to the Belgian Defense Department, two construction workers were killed on Wednesday when they encountered the armament in a construction zone. Earlier this month a large amount of ammunition from the First World War was discovered on the border of the West Flemish municipalities of Passchendaele and Moorslede, for which the Belgian bomb squad, DOVO, is still working to clean up the site. (AP Photo/Kurt Desplenter)
(The Associated Press)

Emergency personnel remove evidence near a covered body after a World War One armament exploded in Ypres, Belgium on Wednesday, March 19, 2014. According to the Belgian Defense Department, two construction workers were killed on Wednesday when they encountered the armament in a construction zone. Earlier this month a large amount of ammunition from the First World War was discovered on the border of the West Flemish municipalities of Passchendaele and Moorslede, for which the Belgian bomb squad, DOVO, is still working to clean up the site. (AP Photo/Kurt Desplenter)
(The Associated Press)

YPRES, Belgium – An armament from World War I has exploded at an industrial site in the former Flanders battlegrounds, killing two construction workers and injuring two more.

Johan Lescrauwaert of the Ypres prosecutor's office said a shell or grenade from the 1914-1918 war exploded near the workers. The circumstances were unclear because there was apparently no digging at the site, the usual cause of such accidents, he told VRT network.

Every year the battlefields in western Belgium throw up hundreds of armaments from the Great War, and most are destroyed without incident by a special Belgian army bomb squad. In a nearby city, the army was completing the destruction of over 800 gas canisters.

The Flanders battlefields cover dozens of cities where allies clashed with German forces for most of the war.